Grinding device for a high grinding rate and for a variable distribution of ground particle sizes

Abstract

A grinding device including a rotor, mounted in rotational manner around an axle and having a plurality of blades extending radially relative to the axle. A sieve has a plurality of openings, with the sieve being mounted around the rotor so as to turn around the axle in the direction opposite the direction of rotation of the rotor. The rotor and sieve each has a height extending parallel to the axle and a width extending perpendicular to the axle wherein the width is between 1 mm and 20 mm. The rotation of the rotor and of the sieve is adjustable so as to reach a difference in circumferential speed between the rotor and the sieve between 100 m / s and 400 m / s, so as to reduce the average initial size of the crushed matter by a factor of 5 to 20.

Description

TECHNICAL FIELD[0001]The present invention concerns a grinding device, comprising a rotor and a sieve, allowing for a high grinding rate and for a variable distribution of ground particle size.STATE OF THE ART[0002]Generally, known systems for processing, by grinding, a material such as a solid or powder substance intended for the manufacture of a pharmaceutical, food or other product, using a rotor mounted in rotational manner against a filtering part or sieve. The material to be granulated is smashed by the rotor and / or pressed between the rotor and the sieve. The sieve allows the crushed matter to be sorted while it flows through the openings.[0003]The sieves are generally static. They classify the materials by making them go through openings that separate them according to the size of the particles.[0004]The desired properties of the ground material, such as the grain size of the particles and the flow rate of the particles, can be obtained by selecting in an adequate manner the...

AI Technical Summary

Benefits of technology

The solution described in this patent allows for high grinding rates and a variable distribution of ground particle sizes by adjusting the speed of the rotor and the sieve. It also results in a significant reduction in the temperature of the crushed matter.

Problems solved by technology

Another problem is to achieve a high throughput rate of the crushed matter through increasingly smaller openings.

The use of sieves for separating increasingly finder powders consequently increases the risks of blocking, as the surface tension of such powders causes them to adhere on the cloth mesh and thus leads to the latter quickly becoming clogged up.

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